How access time variable to other script

Questions & Answers
1

Hello,
i have simple time counter, which stop when my game object is destroyed.

Timer.cs

public class Timer : MonoBehaviour {

	//Timerio kintamieji
	public float startTimeT = 0;
	private string currentTime;
	
	//Gui skinai
	public GUISkin skin;

	private bool timeUpdate = false;

	void Start(){
		timeUpdate = true; 
	}
	
	void Update(){		
		if(timeUpdate){

			startTimeT += Time.deltaTime;
			currentTime = string.Format ("{0:0.00}", startTimeT);
		}
	}

	public void GameOver(){
		timeUpdate = false;
	}
		
	void OnGUI(){
		GUI.skin = skin;
		//Timerio tiksejimas ir spalvos
		GUI.TextField (new Rect(Screen.width - 150,Screen.height - 100, 150, 100), "Time:

" + currentTime);

	}
}

So I am creating a leaderBoard, which shows up when player is destroyed.
My score is equal to seconds which is counted in Timer.cs.
My question is how to show score results in GameOverScript.cs. Now I am getting such an error: NullReferenceException: Object reference not set to an instance of an object

GameOverScript.cs

public class GameOverScript : MonoBehaviour
{
  private GUISkin skin;

		int totalScore = 0;
		string playerName = "";
		
		
		enum gameState {
			waiting,
			running,
			enterscore,
			leaderboard
		};
		
		gameState gs;
	
		dreamloLeaderBoard dl;
		dreamloPromoCode pc;

	public Timer timer;

  void Start()
  {
				// get the reference here...
				this.dl = dreamloLeaderBoard.GetSceneDreamloLeaderboard();
				
				// get the other reference here
				this.pc = dreamloPromoCode.GetSceneDreamloPromoCode();
				
				this.gs = gameState.waiting;
				
				//(Timer)this.GetComponent(typeof(Timer));
				timer = timer.GetComponent<Timer>();
				
				totalScore = (int) timer.startTimeT;
				//totalScore = 10;
				print (totalScore);


    skin = Resources.Load("GUISkin") as GUISkin;
  }



  void OnGUI()
  {
    const int buttonWidth = 140;
    const int buttonHeight = 60;

    GUI.skin = skin;

    if (GUI.Button(
      // Center in X, 1/3 of the height in Y
      new Rect(Screen.width / 2 - (buttonWidth / 2), (1 * Screen.height / 3) - (buttonHeight / 2), buttonWidth, buttonHeight),
      "RETRY"
      ))
    {
      // Reload the level
      Application.LoadLevel("Stage1");
    }

    if (GUI.Button(
      // Center in X, 2/3 of the height in Y
      new Rect(Screen.width / 2 - (buttonWidth / 2), (2 * Screen.height / 3) - (buttonHeight / 2), buttonWidth, buttonHeight),
      "BACK"
      ))
    {
      // Reload the level
      Application.LoadLevel("Menu");
    }


				GUILayoutOption[] width200 = new GUILayoutOption[] {GUILayout.Width(300)};
				
				float width = 400;  // Make this wider to add more columns
				float height = 200;
				//GUI.Box (new Rect (Screen.width - 100,0,100,50)
				Rect r = (new Rect (Screen.width - 100,0,200,100));
				GUILayout.BeginArea(r, new GUIStyle("box"));
				
				GUILayout.BeginVertical();
				
				if (this.gs == gameState.waiting || this.gs == gameState.running)
				{
					

					GUILayout.Label("Total Score: " + this.totalScore.ToString());
					GUILayout.BeginHorizontal();
					GUILayout.Label("Your Name:     ");
					this.playerName = GUILayout.TextField(this.playerName, width200);
					
					if (GUILayout.Button("Save Score"))
					{
						// add the score...
						if (dl.publicCode == "") Debug.LogError("You forgot to set the publicCode variable");
						if (dl.privateCode == "") Debug.LogError("You forgot to set the privateCode variable");
						
						dl.AddScore(this.playerName, totalScore);
						
						this.gs = gameState.leaderboard;
					}
					GUILayout.EndHorizontal();
				}
				
				if (this.gs == gameState.leaderboard)
				{
					GUILayout.Label("High Scores:");
					List<dreamloLeaderBoard.Score> scoreList = dl.ToListHighToLow();
					
					if (scoreList == null) 
					{
						GUILayout.Label("(loading...)");
					} 
					else 
					{
						int maxToDisplay = 20;
						int count = 0;
						foreach (dreamloLeaderBoard.Score currentScore in scoreList)
						{
							count++;
							GUILayout.BeginHorizontal();
							GUILayout.Label(currentScore.playerName, width200);
							GUILayout.Label(currentScore.score.ToString(), width200);
							GUILayout.EndHorizontal();
							
							if (count >= maxToDisplay) break;
						}
					}
				}
				GUILayout.EndArea();
				
  }
}
2

For future posts, please include a copy of the error message copied from the console. It gives us the line number and stack trace.

Your problem is in this line:

  timer = timer.GetComponent<Timer>();

At the time you execute this line ‘timer’ is an uninitialized variable, so you get a null reference exception. If the Timer script is on the same game object as GameOverScript, then you can do:

  timer = gameObject.GetComponent<Timer>();

If it is on a different one, then you will need to find that game object. A typical way would be:

  timer = GameObject.Find("NameOfGameObjectWithTimerScript").GetComponent<Timer>();

http://docs.unity3d.com/412/Documentation/ScriptReference/index.Accessing_Other_Game_Objects.html

http://unitygems.com/script-interaction1/